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Chapter 15: Q12Q (page 616)
Define “fringe field.”
Fringe field is described as the peripheral field of magnet that remains outside the magnetic core.
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A large, thin plastic disk with radiusR = 1.5 m carries a uniformly distributed charge of −Q = −3 × 10−5 C as shown in Figure 15.59. A circular piece of aluminum foil is placed d = 3 mm from the disk, parallel to the disk. The foil has a radius of r = 2 cm and a thickness t = 1 mm.
(a) Show the charge distribution on the close-up of the foil. (b) Calculate the magnitude and direction of the electric field at location × at the center of the foil, inside the foil. (c) Calculate the magnitude q of the charge on the left circular face of the foil.
Two rings of radius are apart and concentric with a common horizontal x axis. The ring on the left carries a uniformly distributed charge of , and the ring on the right carries a uniformly distributed charge of. (a) What are the magnitude and direction of the electric field on the x axis, halfway between the two rings? (b) If a charge of were placed midway between the rings, what would be the force exerted on this charge by the rings?
Question: A hollow ball of radius , made of very thin glass, is rubbed all over with a silk cloth and acquires a negative charge of that is uniformly distributed all over its surface. Location A in Figure 15.64 is inside the sphere, from the surface. Location B in Figure 15.64 is outside the sphere, from the surface. There are no other charged objects nearby.
Which of the following statements about , the magnitude of the electric field due to the ball, are correct? Select all that apply. (a) At location A, is . (b) All of the charges on the surface of the sphere contribute to at location A. (c) A hydrogen atom at location A would polarize because it is close to the negative charges on the surface of the sphere. What is at location B?
If the total charge on a uniformly charged rod of length is 0.4 m is 2.2 nC, what is the magnitude of the electric field at a location 3 cm from the midpoint of the rod?
A student claimed that the equation for the electric field outside a cube of edge length , carrying a uniformly distributed charge , at a distance from the center of the cube, was
role="math" localid="1668495301957"
Explain how you know that this cannot be the right equation.
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